Power amplifier system and howling suppression circuit

Abstract

The invention discloses a power amplifier system and a howling suppression circuit. The howling suppression circuit comprises a first filter, a second filter, a sine wave generator, a phase shifter, a first multiplier, a second multiplier, and a summator. The first filter and the second filter adjust the phases of input sound signals, so that the phase of the sound signal output by the first filter differs by 90 degree from the phase of the sound signal output by the second filter. The sound signal output by the first filter and a sine wave signal are multiplied through the first multiplier. The sound signal output by the second filter and a cosine wave signal are multiplied through the second multiplier. The sound signals output by the first multiplier and the second multiplier are added through the summator, so that the phases of the sound signals output by the first multiplier and the second multiplier are different from the phases of the sound signals input into the first filter and the second filter, so as to undermine conditions causing howling and suppress the howling.

Description

technical field [0001] The invention relates to audio signal processing technology, in particular to a power amplifier system and howling suppression circuit thereof. Background technique [0002] At present, the phenomenon of howling is common in various types of sound reinforcement systems in theaters, conference halls, sports venues, karaoke halls, etc. Often when the volume of the microphone is greatly increased, the sound from the speaker is transmitted Microphone causing howling. The existence of howling not only destroys the sound quality and limits the volume of the microphone, so that the sound picked up by the microphone cannot be reproduced well, but also the deep howling will make the system signal too strong and burn the power amplifier or speaker, especially the tweeter of the speaker . [0003] The generation of howling is almost always caused by the high positive feedback of the audio signal. The sound from the speaker is returned to the microphone, and th...

AI Technical Summary

Problems solved by technology

Improve the acoustics of the room with a compressor that compresses the sound once it exceeds the threshold, but this affects the otherwise useful sound

[0012] 3. Using the compressor, the sound is compressed once it exceeds the threshold, but this affects the originally useful sound

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